Method and apparatus for creating scramble signals in RFID
First Claim
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1. A method for interrogating an RFID tag using an antenna array, comprising the steps of:
- generating from an RF signal source a data signal that causes said RFID tag to respond;
generating from said RF signal source one or more scramble signals that do not cause said RFID tag to respond;
passing said data signal and said one or more scramble signals through a feed network to said antenna array; and
, receiving a response from said RFID tag when said RFID tag is located within a region where said data signal overshadows said one or more scramble signals.
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Abstract
The disclosed inventions relate to a method and apparatus for creating scramble signals. The disclosed inventions further relate to a method and apparatus for creating scramble signals from data signals. The disclosed inventions also relate to a method and apparatus for creating minimum-energy scramble signals. The disclosed inventions further relate to a method and apparatus for exploiting sleep and wake commands to achieve efficient data and scramble signals.
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Citations
20 Claims
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1. A method for interrogating an RFID tag using an antenna array, comprising the steps of:
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generating from an RF signal source a data signal that causes said RFID tag to respond;
generating from said RF signal source one or more scramble signals that do not cause said RFID tag to respond;
passing said data signal and said one or more scramble signals through a feed network to said antenna array; and
,receiving a response from said RFID tag when said RFID tag is located within a region where said data signal overshadows said one or more scramble signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for interrogating an RFID tag using an antenna array, comprising the steps of:
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generating from an RF signal source a data signal that causes said RFID tag to respond;
generating from one or more RF scramble signal sources one or more modulated scramble signals that do not cause said RFID tag to respond;
passing said data signal and said one or more modulated scramble signals through a feed network to said antenna array; and
,receiving a response from said RFID tag when said RFID tag is located within a region where said data signal overshadows said one or more modulated scramble signals. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An RFID data signal and RFID scramble signal generator, comprising:
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a first RF source that produces a first RF signal;
a second RF source that produces a second RF signal;
a data signal modulator that receives said first RF signal and produces said RFID data signal; and
,a scramble signal modulator that receives said second RF signal and produces said RFID scramble signal. - View Dependent Claims (16, 17)
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18. An RFID data signal and RFID scramble signal generator, comprising:
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an RF source that produces an RF signal;
a data signal modulator that receives said RF signal and produces said RFID data signal; and
,a scrambler that receives said RFID data signal and produces said RFID scramble signal. - View Dependent Claims (19, 20)
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Specification